EconData (INFORUM)

This site contains numerous databases with several hundred thousand  series collected from a variety of U.S. government agencies by Inforum, a project that does research and consulting with macroeconomic interindustry models. EconData contains a wide variety of macro data, regional, and international data that are provided in a standardized, easy to use format. The G program is used to open the databases, but data can be exported for use with other software. 

http://www.inforum.umd.edu/econdata/econdata.html